Which retail innovation, first implemented in the early 1900s, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance?

The retail industry has undergone numerous transformations throughout history, evolving from simple trading posts to complex global enterprises. One of the most significant shifts in retail history fundamentally changed how consumers interact with products and ultimately shaped our modern shopping experience. Test your knowledge about this pivotal retail innovation that revolutionized the industry and continues to influence store designs today.

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Self-service grocery stores (Piggly Wiggly model)
Mail-order catalogs with home delivery
Department stores with specialized sections
Coin-operated vending machines for convenience items